<?php
/* 
 * Copyright (c) 2011 Antoine d'Otreppe de Bouvette
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

class StandardHandler implements Handler {
    /**
     * @var Controller
     */
    private $controller;
    
    public function __construct(Controller $controller) {
        $this->controller = $controller;
    }
    
    protected function getMethodName(Request $request) {
        return 'do_'.$request->getMethod();
    }
    
    public function handle(Request $request) {
        $method = $this->getMethodName($request);
        
        if (method_exists($this->controller, $method)) {
            $this->controller->preExec($request);
            $response = $this->controller->$method($request);
            
            if ($response !== null) {
                return $response;
            }
            else {
                return new EmptyResponse();
            }
        }
        else {
            throw new HTTPMethodNotAllowedError();
        }
    }
    
    public function __toString() {
        return "Handler<{$this->controller}>";
    }
    
    /**
     * @return Controller
     */
    public function getController() {
        return $this->controller;
    }
}
